MOBILE, Ala. -- The Mobile Police Department is investigating one of its officers for allegedly having inappropriate sexual contact with a female juvenile in 2009, according to a department news release.

Officer Marshall Freeman, a 20-year veteran of the department assigned to the Community Services Division, is the subject of an administrative and a criminal investigation, according to the release.

Freeman, who resigned Thursday, had been placed on administrative leave after the department received information about the allegations on March 3, the release states.

Chief Micheal T. Williams states in the release that the alleged offense is "not only unethical but also egregious. This is the type of behavior that will never be tolerated in the Mobile Police Department."